Abstract:
The researchers wish to characterize the gravity gradient seismic noise at the LIGO Livingston Observatory (LLO). LIGO (Laser Interferometer Gravitational Wave Observatory) consists of two almost identical large scale land-based Michelson type interferometers sponsored by the NSF. One of these, the LLO, is located in Livingston, LA and the other is at Hanford, WA. This will be a continuation of ... work begun last summer. During last summer we concentrated on measuring the relative microseismic noise between pairs of guralp 3esp sensors separated by distances of 4 km. Most of the measurements were performed inside buildings. About 2-3 weeks were also spent on preliminary gravity gradient noise measurements with typical separations of 5-30 meter. The researchers would like to continue the gravity gradient noise characterization (in the range 1-30 hz1) with an array of guralp 40 T's.